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<pre><code><span class="keyword">macro_rules</span><span class="macro_bang">!</span> <span class="macro declaration public">foo</span> <span class="brace">{</span>
    <span class="parenthesis">(</span><span class="punctuation">$</span>foo<span class="colon">:</span>ident<span class="parenthesis">)</span> <span class="operator">=</span><span class="operator">&gt;</span> <span class="brace">{</span>
        <span class="keyword">mod</span> y <span class="brace">{</span>
            <span class="keyword">pub</span> <span class="keyword">struct</span> <span class="punctuation">$</span>foo<span class="semicolon">;</span>
        <span class="brace">}</span>
    <span class="brace">}</span><span class="semicolon">;</span>
<span class="brace">}</span>
<span class="keyword">fn</span> <span class="function declaration">main</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
    <span class="macro public">foo</span><span class="macro_bang">!</span><span class="parenthesis">(</span><span class="struct declaration macro public">Foo</span><span class="parenthesis">)</span><span class="semicolon">;</span>
    <span class="keyword">mod</span> <span class="module declaration">module</span> <span class="brace">{</span>
        <span class="macro public">foo</span><span class="macro_bang">!</span><span class="parenthesis">(</span><span class="struct declaration macro public">Bar</span><span class="parenthesis">)</span><span class="semicolon">;</span>
        <span class="keyword">fn</span> <span class="function declaration">func</span><span class="parenthesis">(</span><span class="punctuation">_</span><span class="colon">:</span> <span class="module">y</span><span class="operator">::</span><span class="struct public">Bar</span><span class="parenthesis">)</span> <span class="brace">{</span>
            <span class="keyword">mod</span> <span class="module declaration">inner</span> <span class="brace">{</span>
                <span class="keyword">struct</span> <span class="struct declaration">Innerest</span><span class="angle">&lt;</span><span class="keyword const">const</span> <span class="const_param const declaration">C</span><span class="colon">:</span> <span class="builtin_type">usize</span><span class="angle">&gt;</span> <span class="brace">{</span> <span class="field declaration">field</span><span class="colon">:</span> <span class="bracket">[</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span> <span class="brace">{</span><span class="const_param const">C</span><span class="brace">}</span><span class="bracket">]</span> <span class="brace">}</span>
            <span class="brace">}</span>
        <span class="brace">}</span>
    <span class="brace">}</span>
<span class="brace">}</span></code></pre>